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Gravity anomaly during the Mohe total solar eclipse

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Gravity anomaly during the Mohe total solar eclipse

RESISTIVITY PRECURSORS AND SPREADING OF FAULT PRIOR TO ITS INSTABILITY

中国科学院地质与地球物理研究所2.01学术年会

作者： wang qianshen~1,YANG Xinshe~(1,2. & TANG Keyun~1 1.{2. of geophysics,Chinese academy of Sciences,beijing 100101,china 2.Department of Applied Mathematics,University of Leeds,Leeds LS2.9JT,UK

By using a high-precision LaCoste-Romberg (D-12.#) gravimeter,continuous and precise measurements were carried out during the March 9,1997 total solar eclipse in the Mohe region in Northeast *** gravity variations were digitally recorded during the total solar eclipse so as to investigate the possible anomaly of the sun and the moon’s gravitational fields on the *** the careful processing and analysis of the observed data,no significant anomaly during the very solar eclipse has been ***, there are two ’gravity anomaly valleys’ with near symmetrical decrease of about 6—7μGal at the first contact and the last contact This is the anomaly phenomenon observed and reported for the first time in the *** note presents some analyses and discussions.

关键词： Mohe total solar eclipse gravity anomaly

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Science in china,Ser.B 1985年第4期28卷 420-436页

作者：王新华祁贵仲赵玉林 institute of geophysics State Seismological Bureau beijing

Based on fracture mechanics it has been found that earthquake precursors related to volumetric strain e are characterized by quadrants, blind zone and uneven propagation, and the approximate formulae for spreading range of precursor have been obtained. These results are coincident with the information of resistivity ρx observed before the Tangshan earthquake, and then mechanical explanations have been made for some precursors of ρx, such as precursors appearing concentratedly within the period of 1—2.years before the instability of the fault （i.e. subcritical period in which the fault spreads acceleratingly）. Before instability of the spreading of fault, the range of e=10-6 reaches about 150 km, its propagating velocity is about 100 km/yr, the amplification coefficient of ρx is about 104, etc. The half length of fault before instability is about 3.km. It seems that in propagating process the spreading of the fault is delayed by barrier.

关键词： spreading blind propagating approximate volumetric instability formulae contour resistivity appearing

Gravity anomaly during the Mohe total solar eclipse

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Chinese Science Bulletin 2001年第21期46卷 1833-1836页

作者： wang qianshen YANG Xinshe TANG Keyun institute of geophysics Chinese Academy of SciencesBeijing 100101China Department of Applied Mathematics University of LeedsLeeds LS2 9JTUK

By using a high-precision LaCoste-Romberg (D-12.#) gravimeter, continuous and precise measurements were carried out during the March 9,1997 total solar eclipse in the Mohe region in Northeast china. The gravity variations were digitally recorded during the total solar eclipse so as to investigate the possible anomaly of the sun and the moon’s gravitational fields on the earth. After the careful processing and analysis of the observed data, no significant anomaly during the very solar eclipse has been found. However, there are two ’gravity anomaly valleys’ with near symmetrical decrease of about 6-7 μGal at the first contact and the last contact. This is the anomaly phenomenon observed and reported for the first time in the literature. This note presents some analyses and discussions.

关键词： Mohe total solar eclipse gravity anomaly.

Chemical, carbon and sulfur isotopic compositions constrain the origin of Upper Carboniferous-Lower Triassic gases in eastern Sichuan Basin, SW china

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Science china Earth Sciences 2024年第10期67卷 3169-3185页

作者： Chunfang CAI Ilya KUTUZOV Wenhua MEI Daowei wang Bing LUO Shipeng HUANG Bing HE Alon AMRANI china University of Petroleum National Key Lab Petroleum Resource&EngineeringBeijing 102249China State Key Laboratory of Lithospheric and Environmental Coevolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China institute of Earth Sciences The Hebrew UniversityJerusalem 91904Israel College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China yulin University Yulin 719000China Research institute of Exploration and Development Southwest Oil&Gas Field CompanyPetroChinaChengdu 610051China Petrochina Research Institute of Petroleum Exploration and DevelopmentBeijing 100083China

Methane dominated gas is one of the cleanest energy resources;however, there is no direct method to determine its source rock. Natural gases produced from the eastern Sichuan Basin together with seismic data were studied for their sources and secondary alteration by thermochemical sulfate reduction(TSR). Our results demonstrate that Upper Permian to Lower Triassic(P_(3.ch-T_(1)f) gases in the surrounding of the Kaijiang-Liangping area show volatile organic sulfur compounds(VOSCs) δ^(3.)S values close to those of the associated H_(2.S, and may have been altered by methane-dominated TSR, resulting in positive shift in methane δ^(13.C_(1)values with increasing TSR extents. Other(or group 2. gases produced from the P_(3.ch-T_(1)f reservoirs from the southern area and the Upper Carboniferous to Middle Permian(C_(2.h-P_(2.q) from the eastern Sichuan Basin are not significantly changed by TSR, show similar δ^(3.)S values between the kerogens and some VOSCs, and may have been derived from the Lower Silurian and Middle Permian source rocks. This study demonstrates a case for the first time showing the δ^(3.)S values of VOSCs can be used as a tool for direct correlation between non-TSR altered gas and source rocks. Methane-dominated gas pools can be found using gas and source rock geochemistry combined with seismic data.

关键词： Sulfur isotopes Volatile organic sulfur compounds Thermochemical sulfate reduction Sichuan Basin Gas-source rock correlation

满都拉—卡楚加的长剖面地壳介质密度分布及深部结构特征探榷

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地球物理学报 2023年第1期66卷 173-182页

作者：王谦身滕吉文陈石文武徐伟民中国科学院地质与地球物理研究所北京100029 吉林大学地球探测科学与技术学院长春130026 中国地震局地球物理研究所北京100081

通过对南起中国内蒙古满都拉、向北经蒙古国、直抵北端俄罗斯贝加尔湖北卡楚加全长13.0} km长重力剖面的布格重力异常数据进行处理和解析,依其构建了沿剖面的二维地壳密度结构模型,并详细分析了沿剖面的地壳底界面(Moho界面)展布的深部... 详细信息

通过对南起中国内蒙古满都拉、向北经蒙古国、直抵北端俄罗斯贝加尔湖北卡楚加全长13.0} km长重力剖面的布格重力异常数据进行处理和解析,依其构建了沿剖面的二维地壳密度结构模型,并详细分析了沿剖面的地壳底界面(Moho界面)展布的深部构造特征,及剖面辖域内的5个次级局部构造单元的重力异常场、地壳密度结构、界面起伏及断裂构造分布的特征.期望此研究结果能为该剖面跨越的中亚造山带东部地区的地壳结构、各次级构造单元的界域与关联方面的进一步研究提供相关的重力场依据.

关键词：满都拉—卡楚加蒙古弧布格重力异常地壳密度结构

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西构造结—帕米尔及周边深部结构与构造探榷

地球物理学报 2020年第8期63卷 2970-2977页

作者：王谦身滕吉文陈石文武张永谦徐伟民中国科学院地质与地球物理研究所北京100029 吉林大学地球探测科学与技术学院长春130026 中国地质科学院矿产资源研究所北京100037 中国地震局地球物理研究所北京100081

帕米尔高原是五大山脉汇结之中心,被称为“西构造结”.在此山高耸谷陡深是人迹罕至的无人区.应用稀少的地面重力和人工地震数据和卫星重力资料,以NNW和NEE向两条长达162. km的十字交叉剖面,对帕米尔高原地区地壳深部结构与区域地质构造... 详细信息

帕米尔高原是五大山脉汇结之中心,被称为“西构造结”.在此山高耸谷陡深是人迹罕至的无人区.应用稀少的地面重力和人工地震数据和卫星重力资料,以NNW和NEE向两条长达162. km的十字交叉剖面,对帕米尔高原地区地壳深部结构与区域地质构造进行了研讨.帕米尔高原中心地区地壳厚度(莫霍界面深度)接近70 km,并在总体上呈向四周逐渐延展减薄(变浅)的总趋势,到帕米尔的周边地区减薄为50余km左右.这里是一个壳幔结构变异的构造强烈活动地域.

关键词：帕米尔西构造结重力异常密度结构地壳厚度

Impending HRT wave precursors to the Wenchuan M_s8.0 earthquake and methods of earthquake impending prediction by using HRT wave

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Science china Earth Sciences 2009年第10期52卷 1572-1584页

作者： QIAN FuYe ZHAO BiRu QIAN Wei ZHAO Jian HE ShiGen ZHANG HongKui LI ShiYu LI ShaoKun YAN GuLiang wang ChengMin SUN ZhenKai ZHANG DongNing LU Jun ZHANG Ping YANG GuoJun SUN JiaLin GUO ChunSheng TANG YuXiong XU JianMing XIA KunTao JU Hang YIN BangHong LI Ming YANG DongSheng QI WeiLuo HE TaiMing GUAN HuaPing ZHAO yulin institute of geophysics China Earthquake AdministrationBeijing 100081China Tianjin Hi-tech Development Co.Ltd Tianjin 300201China Department of Physics University of TorontoL6C1V9Canada College of Disaster Prevention Techniques Yanjiao 065201China Earthquake Administration of beijing Municipality Beijing 100080China Earthquake Administration of Sichuan Province Chengdu 610041China Committee of National Development and Reformation Beijing 100824China institute of Earthquake Science China Earthquake AdministrationBeijing 100036China china Earthquake Network Center Beijing 100036China Earthquake Administration of Yunnan Province Kunming 650041China Earthquake Administration of Tianjin Municipality Tianjin 300201China Earthquake Administration of Inner Mongolia Autonomous Region Huhhot 010010China The Gucheng District Bureau Lijiang674100China

We deployed four geo-electric monitoring stations in Sichuan and Yunnan provinces from 2.04, using the new generation of equipment (PS-100) and technologies to capture the HRT wave earthquake precursor. Before the Wenchuan Ms8.0 earthquake, we recorded the HRT wave precursor at the only operating station in Hongge (HG, Δ=465 km) and found that significant impending signal had been recorded at the station in the early morning ( 0―5 am) of 12.h of May, 2.08. The precursor for this earthquake is consistent with precursors recorded for other strong earthquakes. The measured physical properties (geo-resistivity and telluric-current) show tidal wave period oscillations from several days to several months before the earthquakes and the amplitude of such HT oscillation increases significantly towards the occurrence of an earthquake. These HT and RT waves from the epicenter have a causal relationship with the earthquakes that happened several days later. The arrival time of two RT waves is proportional to the distance from the station to the epicenter. The estimated natural decay of the amplitude is correlated with the natural period (T0) of the earthquake fault, which is proportional to the fault length. From this relationship, we can predict the earthquake magnitude. For magnitude 6―9 earthquakes, the natural period is about 1―6 hours. Such oscillation comes from the epicenter area and they can propagate several thousand kilometers in the Earth's crust. Before a strong earthquake in the shallow crust, the conductive pore fluid will experience major changes before the fault rapture. Such fluid change will emit an oscillation in the pore fluid pressure. This is the mechanism for the HRT wave generation. Since the{3. Earthquake Administration funded the HRT wave short-term earth-quake prediction project in 2.03. the first record of HRT precursor wave has been recorded from the 2.04-12.2. Sumatra Mw9.0 earthquake with the largest epicentre distance Δ=2.00 km. Thereafter, we

关键词： Wenchuan Ms8.0 earthquake HRT wave (mechanism) model PS-100 geo-resistivity meter HRT wave precursor precursor consistency feasibility of short-term and impending earthquake prediction

中上扬子地区震旦纪灯影组沉积期碳酸盐岩台地古地理格局及有利储集相带分布规律

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沉积学报 2024年第3期42卷 928-943页

作者：丁一刘树根文龙文华国陈代钊宋金民王瀚王林康陈明思陈荣庆李智武成都理工大学油气藏地质及开发工程国家重点实验室成都610059 成都理工大学沉积地质研究院成都610059 西华大学成都610039 中国石油西南油气田公司勘探开发研究院成都610041 中国科学院地质与地球物理研究所新生代地质与环境重点实验室北京100029

【目的】中上扬子地区灯影组沉积期碳酸盐岩台地古地理格局及有利储集相带发育分布规律尚存争议,阻碍了灯影组油气勘探领域由绵阳—长宁拉张槽两侧向其他广大地区拓展。【方法】通过中上扬子地区灯影组3.余条剖面(钻井)开展岩石类型划... 详细信息

【目的】中上扬子地区灯影组沉积期碳酸盐岩台地古地理格局及有利储集相带发育分布规律尚存争议,阻碍了灯影组油气勘探领域由绵阳—长宁拉张槽两侧向其他广大地区拓展。【方法】通过中上扬子地区灯影组3.余条剖面(钻井)开展岩石类型划分及沉积相分析,【结果】进一步明确丘滩相以块状砂屑/鲕粒白云岩及柱状、穹窿状叠层石白云岩为特征,呈环带状分布在中上扬子台地(或内缓坡)边缘,向外过渡为中—外缓坡风暴岩或斜坡—盆地相区的滑塌角砾白云岩、泥质白云岩、硅质岩等。由于丘滩的阻挡作用,其内侧以低能的潮坪及潟湖沉积环境为主:其中潮坪相主要发育微生物纹层白云岩、穹窿—缓波状叠层石白云岩、凝块石白云岩夹砂屑白云岩、泥晶白云岩,纵向上常常形成米级—厘米级旋回;潟湖相主要由泥晶白云岩、含球粒/砂屑泥晶白云岩组成。相带时空分布表明灯影组在中上扬子地区总体呈现出进积的沉积趋势,内部包含2.5个层序,即三次进积(变浅)和两次退积(变深)旋回。【结论】由于灯影组在台地边缘—斜坡区域普遍遭到剥蚀,以及灯影组沉积期上扬子台地范围远超目前的板块边界,灯影组上部灯四段很少发现高能丘滩相带。在此背景下,局部地区(如松林—岩孔地区、中扬子台地周缘)灯影组中下部灯一段—灯二段(或蛤蟆井段、石板滩段)发育的丘滩相,是重要的有利储集相带。此外,处于海退体系域的灯二段中下部和灯四段上部(或相当层位)在中上扬子台地(或内缓坡)内部广泛发育微生物白云岩,也为储层发育有利相带。在中上扬子台地微生物白云岩广泛分布的背景下,进一步分析优质储层发育机理与分布规律才是找到油气接替区的关键。

关键词：中上扬子地区灯影组碳酸盐岩台地古地理格局储集相带

滇西“碱质热液型”金多金属矿床地质特征与找矿模型

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矿床地质 2022年第4期41卷 659-681页

作者：张长青毛景文周云满李其在娄德波刘欢王利东郑瑜林周癸武王瑞孙嘉李德先韩润生李杨林孔志岗中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室北京100037 中国地质大学(北京) 科学研究院北京100083 云南黄金矿业集团股份有限公司云南昆明650200 昆明理工大学国土资源工程学院云南昆明650093

滇西地区地质构造演化复杂,成矿地质条件优越,经历了多期次、多类型成矿作用,形成了多条各具特色的金多金属成矿带。文章通过对区内金沙江-哀牢山金多金属成矿带内北衙、马厂箐、姚安、长安等典型矿床的解剖和对比研究,发现带内金多金... 详细信息

滇西地区地质构造演化复杂,成矿地质条件优越,经历了多期次、多类型成矿作用,形成了多条各具特色的金多金属成矿带。文章通过对区内金沙江-哀牢山金多金属成矿带内北衙、马厂箐、姚安、长安等典型矿床的解剖和对比研究,发现带内金多金属矿床与经典的斑岩型矿床相比具有显著的差异性,主要表现是:成矿岩体岩性以碱性系列为特征,w(K_(2.O+Na_(2.O)超过8%;成矿流体碱质含量偏高,流体阳离子(K^(+)+Na^(+))含量约占流体总量的87%~95%;成矿过程中,除岩浆热液参与成矿外,岩浆气水热液与围岩间的水岩反应,是导致矿质沉淀的主体;自成矿岩体向外依次发育裂隙脉型、矽卡岩型、构造破碎带型和石英硫化物脉型矿化,组成多位一体。文章基于典型矿床特征的系统总结,提出了“碱质热液型”金多金属矿床的概念,并对其成矿作用过程进行了初步探讨。最终,文章构建了滇西地区碱质热液型金多金属矿地物化遥综合找矿模型,并指导相关矿床找矿勘查取得了重要进展。

关键词：地质学碱质热液型矿化蚀变分带找矿方法金多金属矿床滇西

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